The Elder Scrolls III: Morrowind
From Widescreen Gaming Wiki
 Game Information
The Elder Scrolls III: Morrowind is an epic, open-ended single-player game where you create and play any kind of character you can imagine. Be the noble hero embarking on an epic quest, or an insidious thief rising to leadership of his guild. Be a malevolent sorcerer developing the ultimate spell of destruction, or a reverent healer searching for the cure to a plague. Your actions define your character, and your gameplay changes and evolves in response to your actions. Confront the assassins' guild, and they take out a contract on you. Impress them, and they try to recruit you instead. No two sagas are the same in the world of Morrowind.
Players can choose to follow the intriguing main storyline, or set off to explore the huge province of Morrowind and the many interesting people and exotic locations it contains. Vast cities and remote villages dot the landscape, each with its own unique look and feel. Hundreds of quests and adventures await as you interact with characters and learn more. Regardless of whether you play a murdering assassin or a noble knight, the game holds endless possibilities and allows you to revisit the main storyline at any time.
 Widescreen Support
The Elder Scrolls III: Morrowind does not have native support for widescreen resolutions (as of version 1.2.0277). Resolution preferences are stored as keys in the Windows registry, so if you're comfortable with regedit, browse to Bethesda Softworks/Morrowind and edit 'Screen Height' and 'Screen Width' to your preferred values. Make sure you edit in 'decimal' mode, unless you understand hexadecimal.
The third party mod "Morrowind Graphics Extender" adds full widescreen support along with things like anti-aliasing or anisotropic filtering.
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Official Site: http://www.elderscrolls.com/games/morrowind_overview.htm